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BMW Cooling System Parts & Accessories for BMW E30 M3 S14 2.3L

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The cooling system is arguably the weakest point in numerous BMWs. If you drive an aging BMW or plan on taking your car to the track like we do, we recommend beefing up your cooling system before going to the track. Generally, the main components in your cooling system that are prone to failure include the following: expansion tank, factory hoses, water pump, thermostat, fan (especially if your vehicle comes factory with a clutch fan), and radiator. Factory BMW expansion tanks are plastic and prone to either breaking off at connection points or combusting. As factory rubber hoses age they either crack or break over time - we offer silicone cooling hose upgrades for most applications to avoid future failures. If you have an older vehicle, your water pump likely comes from the factory with a plastic impeller - we offer upgraded water pumps with metal impellers that are far more reliable. Newer model BMWs utilize electric water pumps - BMW spent millions of dollars engineering these water pumps, but they fail so often that we recommend replacing at 60,000 mile service intervals to avoid being stranded on the side of the road. In terms of thermostats, we offer various upgraded thermostats for racing applications. If your BMW utilizes a clutch fan from the factory, we have several options available in terms of universal electric fans - we recommend replacing these to avoid sending brittle plastic fan blades through your hood. For radiators, we recommend swapping out your radiator for one that does not use plastic connection points like your factory radiator.

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Water Hose Set - E30 M3

10X Entries Into Our F80 M3 Sweepstakes

T#:3449

Part#: 11531309667KIT

Ships in 2 Business Days

$ 167.05 USD

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$ 167.05 USD

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This pacakge of six rubber cooling hoses for the E30 M3 includes most of the commonly replaced coolant lines on the S14. Set includes -

upper radiator hose from the large metal coolant pipe, #23 in the diagram

top thermostat hose to the large metal coolant pipe, #15 in the diagram

middle thermostat hose (T-shaped) to the small metal coolant pipe and to the water pump, #13 in the diagram

lower thermostat hose to the bottom of radiator, #22 in the diagram

lower radiator hose to coolant pipe, #24 in the diagram

expansion tank hose to the small metal coolant pipe, #17 in the diagram
We use a mix if OE BMW and aftermarket hoses that we trust. This is the original E30 M3 Cooling Hose kit that we have been selling for 20 years. Looking for hose clamps too? We have OEM-style clamps for these too, select this in the options list below.

This item fits the following BMWs:
1988-1991 E30 BMW M3

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Turner OEM Water Hose Set - E30 M3

10X Entries Into Our F80 M3 Sweepstakes

T#:338252

Part#: 11531309667KIT

Ships in 4 Business Days

Sale - Save 3% $ 212.99

This product was last offered at the strikethrough price on
05-03-2026

Starting at $ 206.38 USD

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Sale - Save 3%

$ 212.99

This product was last offered at the strikethrough price on
05-03-2026

Starting at $ 206.38 USD

Add to Wish List

This pacakge of six rubber cooling hoses for the E30 M3 includes most of the commonly replaced coolant lines on the S14. Set includes -

upper radiator hose from the large metal coolant pipe, #23 in the diagram

top thermostat hose to the large metal coolant pipe, #15 in the diagram

middle thermostat hose (T-shaped) to the small metal coolant pipe and to the water pump, #13 in the diagram

lower thermostat hose to the bottom of radiator, #22 in the diagram

lower radiator hose to coolant pipe, #24 in the diagram

expansion tank hose to the small metal coolant pipe, #17 in the diagram
We use a mix if OE BMW and aftermarket hoses that we trust. This is the original E30 M3 Cooling Hose kit that we have been selling for 20 years. Looking for hose clamps too? We have OEM-style clamps for these too, select this in the options list below.

This item fits the following BMWs:
1988-1991 E30 BMW M3

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Complete Cooling System Overhaul Package - 1988-1991 E30 M3

10X Entries Into Our F80 M3 Sweepstakes

T#:338650

Part#: TMS16418

Ships in 1-2 days

Starting at $ 713.99 USD

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Starting at $ 713.99 USD

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This cooling package for the E30 M3 consists of all of the major components on the S14's cooling system. There are no major weak points to the E30's cooling system, unless you count skipped maintenance. The entire system is serviceable in individual components so you don't need to buy a complete package of parts. Many of the indivdual parts are on our site but we have setup this package to cover all or most of what you would need to perform a major overhaul. This overhaul package consists of an Genuine BMW radiator and then you build the package from there. Add hoses, sensors, water pumps, thermostats, gaskets, hose clamps, and more. We also sell the Original BMW antifreeze to finish off the job.

Any problems with the cooling system are likely electrical. Sensors become corroded and fail over time which will send the incorrect signal to the corresponding unit, including the engine computer. Diagnosis of electrical type problems is easy and repair with the OEM Bosch or OE BMW sensors is not too expensive for a car like this. Electrical connections, particularly solder joints, can also become brittle and fail. These are not helped by the intense vibrations of the S14.

Top Turner Tip for a healthy S14!
E30 M3s always seem to have cooling problems at the most inconvenient time. If the temp gauge starts rising in the summer months first check and make sure your auxiliary cooling fan is working if it's not it's most likely the switch or the wiring going to the switch. Also remember that the E30 instrument conductor plate can make the gauge read whacky try tapping the gauge if it seems like it's acting up. When it's time to do a water pump (which weeps through a hole on the bottom before it goes completely) take a good look at the radiator too its not expensive and you have to remove it to install the pump anyway.

Use the options below to build your package.

This cooling package fits the following BMWs:
1988-1991 E30 BMW M3

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Stock Replacement Radiator - E30 M3

10X Entries Into Our F80 M3 Sweepstakes

T#:338019

Part#: 17112225592

Back Ordered

$ 347.99

This product was last offered at the strikethrough price on
08-13-2026

Starting at $ 258.99 USD

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Starting at $ 258.99 USD

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This is a new stock E30 M3 Radiator. We offer both Genuine BMW or Nissens brand radaitors. The Genuine BMW radiator is the highest quality radiator available. The Nissens is a high quality aftermarket radatior.

This item fits the following BMWs:
1988-1991 E30 BMW M3

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Water Pump - E30 M3

10X Entries Into Our F80 M3 Sweepstakes

T#:337980

Part#: 11511315211

Back Ordered

Starting at $ 299.99 USD

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Starting at $ 299.99 USD

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This is the stock replacement water pump for the E30 M3. This is the Genuine BMW pump and includes a new OE BMW gasket. It's always a good idea to have one as a spare. Even if it sits on your shelf for awhile it's going to be used at some point (and prices for Genuine E30 M3 parts aren't getting any lower). Aftermarket pumps have been in short supply and the quality hasn't been as good as the Original BMW pump so we have decided to stop offering aftermarket brands like Laso or Saleri. This is the Genuine BMW part, straight from BMW.

This item fits the following BMWs:
1987-1991 E30 BMW M3

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Achilles Motorsport OBD1-to-OBD2 Coolant Hose Adapter - BMW M52 S52 E...

For models with a OBD2 24v Swap (M5X, S5X engines) only!

T#:1150775

Part#: 11-AM-CHCAP-OBD1

In Stock

$ 54.99 USD

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$ 54.99 USD

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OBD2 to OBD1 Conversion Coolant Hose Adapter for E36 M52 & S52 Engines Replaces the metal pipe from the OBD2 engines with a hose adapter that allows the installation of a normal OBD1 coolant hose. This is useful when converting an OBD2 Engine to OBD1, or when swapping OBD2 engines into a car that is originally OBD1 (like an E30). The simple kit comes complete with the necessary 2 O-rings, extended bolt, Nylon Lock Nut & washers to make this a quick install. No need to wait! It is also completely reversible!

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Race German Coolant Temperature Sender Adapter - M12x1.5

T#:6827887

Part#: RGCTSAM12

Ships in 2 Business Days

$ 35.99 USD

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$ 35.99 USD

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Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for M12x1.5 sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor

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Race German Coolant Temperature Sender Adapter - 1/8NPT

T#:6827888

Part#: RGCTSA1/8NPT

In Stock

$ 35.99 USD

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Qty

$ 35.99 USD

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Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for 1/8NPT sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor

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Race German Rethreaded Coolant Sensor

T#:2602235

Part#: 001-08-00-00-09

Ships in 1 Business Day

$ 50.00 USD

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$ 50.00 USD

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Often overlooked item for your 24V E30 swap, this sensor is the best option for a plug and play solution to have a working temperature gauge when doing a engine swap.

Radiator Fan Switch Plug - E30, E34, E36, E23, E32

T#:23947130

Part#: E30RADFANSP

In Stock

$ 17.99 USD

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$ 17.99 USD

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Thanks to its brittle plastic construction, this radiator fan switch plug is a common failure point. Race German offers this high-quality replacement to remedy this issue and get your car back to perfect operation.

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